Commun. Korean Math. Soc. 2000 Vol. 15, No. 2, 357-370
Ki-Yeol Yang Sunchon National University
Abstract : In [6], Cheng-Ye You gave a condition equivalent to the Nielsen number product formula for fiber maps. And Jerzy Jezierski also gave a similar condition for coincidences of fiber maps. The main purpose of this paper is to find the condition for which holds the product formula for Nielsen root numbers $N(f;a) = N(\bar f;\bar a) N(f_b ;a)$.
